Unravelling the migration and moult strategies of a long-distance migrant using stable isotopes:: Red Knot Calidris canutus movements in the Americas

被引:58
作者
Atkinson, PW [1 ]
Baker, AJ
Bevan, RM
Clark, NA
Cole, KB
Gonzalez, PM
Newton, J
Niles, LJ
Robinson, RA
机构
[1] British Trust Ornithol, Thetford IP24 2PU, Norfolk, England
[2] Royal Ontario Museum, Ctr Biodivers & Conservat Biol, Toronto, ON M5S 1C6, Canada
[3] Univ Toronto, Dept Zool, Toronto, ON, Canada
[4] Newcastle Univ, Sch Biol, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[5] DNREC, Div Soil & Water Conservat, Delaware Coastal Programs, Sagamiko, Kanagawa 19901, Japan
[6] Fdn Inalafquen, RA-8520 San Antonio Oeste, Rio Negro, Argentina
[7] Scottish Univ Environm Res Ctr, NERC Life Sci Mass Spectrometry Facil, E Kilbride G75 0QF, Lanark, Scotland
[8] New Jersey Div Fish & Wildlife, Endangered & Nongame Species Program, Trenton, NJ 08625 USA
关键词
D O I
10.1111/j.1474-919x.2005.00455.x
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
For long-distance migrants, such as many of the shorebirds, understanding the demographic implications of behavioural strategies adopted by individuals is key to understanding how environmental change will affect populations. Stable isotopes have been used in the terrestrial environment to infer migratory strategies of birds but rarely in marine or estuarine systems. Here, we show that the stable isotope ratios of carbon and nitrogen in flight feathers can be used to identify at least three discrete wintering areas of the Red Knot Calidris canutus on the eastern seaboard of the Americas, ranging from southeastern USA to Patagonia and Tierra del Fuego. In spring, birds migrate northwards via Delaware Bay, in the northeastern USA, the last stopping point before arrival in Arctic breeding areas, where they fatten up on eggs of spawning Horseshoe Crabs Limulus polyphemus. The isotope ratios of feather samples taken from birds caught in the Bay during May 2003 were compared with feathers obtained from known wintering areas in Florida (USA), Bahia Lomas (Chile) and Rio Grande (Argentina). In May 2003, 30% of birds passing through the Bay had Florida-type 'signatures', 58% were Bahia Lomas-type, 6% were Rio Grande-type and 7% were unclassified. Some of the southern wintering birds had started moulting flight feathers in northern areas, suspended this, and then finished their moult in the wintering areas, whereas others flew straight to the wintering areas before commencing moult. This study shows that stable isotopes can be used to infer migratory strategies of coastal-feeding shorebirds and provides the basis for identifying the moult strategy and wintering areas of birds passing through Delaware Bay. Coupled with banding and marking birds as individuals, stable isotopes provide a powerful tool for estimating population-specific demographic parameters and, in this case, further our understanding of the migration systems of the declining Nearctic populations of Red Knot.
引用
收藏
页码:738 / 749
页数:12
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